NS486SXL NSC [National Semiconductor], NS486SXL Datasheet - Page 20

• Manufacturer Part Number: NS486SXL
• Description: Optimized 32-Bit 486-Class Controller with On-Chip Peripherals for Embedded Systems
• Manufacturer: NSC [National Semiconductor]

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t
t
t
t
t
t
t
t
t
t
t
t
t
t
t
t
Symbol
OFF
RAS
RAH
RCD
RCH
RCS
RP
WCH
WCS
Symbol
AHCD
ASCD
CDPW
CHCD
CSCD
DOFF
RCAT
DRAM Interface Timing Specification
ISA-like Bus Cycles Timing
Specification
**The CLK signal is only included as a reference; no specifications are guarantee to this signal.
Read Data Valid Hold Time
RAS Pulse Width
Row Address Hold Time
RAS to CAS Delay Time
Read Command Hold Time
Read Command Setup Time
RAS Precharge Time
Write Command Hold Time
Write Command Setup Time
Address Hold Time from CMD
Address Setup Time to CMD
Command Pulse Width
Chip Select Hold Time from CMD
Chip Select Setup Time to CMD
Read Data TRI-STATE
Read CMD Data Access Time
TABLE 18. 3 Cycle Miss Preliminary Specifications (Continued)
TABLE 19. No Command Delay ISA-like Bus Specifications
Parameter
FIGURE 9. ISA-like Bus Timing Diagram
Parameter
20
(Continued)
1.0T + (Wait)T +
1.0T + (Wait)T +
Formula
1.0T +
1.0T +
1.0T +
1.0T +
1.0T +
Formula
2.0T +
0.5T +
1.0T +
0.5T +
1.0T +
0.5T +
0.5T +
Min
−20
−20
−10
−25
−40
Min
−15
−10
−20
−20
−20
−5
0
0
0
DS100121-14
PROG
Max
Max
−25
−30